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Date: 2015-10-07; view: 456.

Find at least 10 international words in the text and underline them.

These great old radiators used a combination of radiation and conduction to heat a room. Down in the basement was usually a steam boiler converting the chemical energy stored in coal (in the old days) or fuel oil or natural gas (more common nowadays), into "heat" which was used to convert liquid water into gas phase water (steam). The steam flowed up into the radiators where its heat was transferred by conduction to the air and by radiation to the objects in the room.